CK NPC wieght not working

[Joedpa]

I made a custom body for an NPC of mine. But, when I try to change the weight of the character to something other than 100, the body does not change. The rest of it does (feet, hands and neck), it's just the body mesh that does not change.

Why?

 

Also, in game is the same, and I used Mesh Rigger to replace the bones of SOS with the Vanilla one.